JPS6132690A - Recording and reproducting device of still picture - Google Patents

Abstract

PURPOSE:To improve the cost performance by separating luminance and chroma signals with the aid of a color video signal and a comb-shaped filter and converting the chroma signal into a line sequential color difference signal and recording it together with the luminance signal on a magnetic disk sheet as still picture information. CONSTITUTION:Video signals obtained from a CCD 5 are introduced to a synchronization adding circuit 7 and a matrix circuit 8 as a luminance signal and R, G and B signals respectively through process amplifiers 6a-6d. After a luminance signal Y is FM-modulated in a high frequency by an FM modulator 9, it is supplied to a magnetic head 13 through a by-pass filter 10, mixer 11 and recording amplifier 12, and recorded on a magnetic disk 14. On the other hand, color difference signals R-Y and B-Y of the matrix circuit 8 are converted into line sequential signals by a changeover switch 15, supplied to an FM modulator 16, introduced to the mixer 11 through a low-pass filter 17, mixed with an FM luminance signal, and finally recorded on the disk 14.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording and reproducing apparatus for recording still image video signals on a magnetic disk sheet and reproducing the same.

BACKGROUND ART AND PROBLEMS Electronic still cameras incorporating a solid-state imager such as a COD and a magnetic disk sheet drive device are being commercialized. By installing a magnetic disk sheet cassette recorded with such an electronic still camera into a special playback machine, it is possible to play back still images and a monitor TV for each track of dozens of tracks. Since such playback machines for electronic still cameras are dedicated machines, they are expensive and have low cost performance in comparison to their performance.

Purpose of the Invention The present invention was made in order to solve this problem, and aims to improve the overall cost performance by adding a recording function by using the mechanical part and circuit part of the playback machine. .

Summary of the Invention The still image recording and reproducing device of the present invention separates a color video signal into a luminance signal and a chroma signal using a comb filter.
The chroma signal is provided with a recording circuit that converts the chroma signal into a line-sequential color difference signal (alternate horizontal scanning R-Y and B-Y signals) and records it together with a luminance signal on a magnetic disk sheet as still image information. Furthermore, the line-sequential color difference signal in the reproduced signal obtained from the recorded magnetic disk sheet is converted into a simultaneous signal, the luminance signal is converted from a field still signal to a frame still signal, and these conversion outputs are combined to produce a color still signal. and a reproducing circuit configured to obtain an image video signal. According to this configuration, a recording function is added in addition to a playback function with a relatively simple configuration, resulting in an extremely cost-effective device.

Example The present invention will be explained below based on Example I.

Fig. 1 i is a schematic block diagram of an electronic still camera system to which the present invention can be applied; Viewer-3 (player) displays the still playback video on the monitor TV by playing it back.Viewer-3
is equipped with a magnetic disk sheet drive mechanism 3a and a reproducing circuit 3b for reproducing magnetic disks.

The viewer 3 also includes a recording circuit 3c for recording an external video signal such as an NT8C signal obtained from an external TV tuner onto a magnetic disk sheet. This external video signal is format-converted according to the same recording format as the electronic still camera 1. Data is recorded on the tracks of the magnetic disk cassette 2 based on the operation of the magnetic disk sheet drive mechanism 3a. The recorded external video signal is displayed on a monitor screen by attaching the magnetic disk cassette 2 to the viewer 3 and playing it back.

In this way, the viewer 3 can be used as a playback device for an electronic still camera, and also as a recording and playback device for recording and playing back broadcast TV signals and video camera outputs. In order to improve cost performance, the drive mechanism including the magnetic head is shared between recording and reproduction, and a portion of each of the recording circuit 3C and the reproduction circuit 3b is shared.

FIG. 2 is a block diagram of the recording system of the electronic still camera 1 shown in FIG.

In FIG. 2, the video signal obtained from the CCD 5 is transmitted through process amplifiers 6a to 6d to brightness signals Y, R, G.
, B signals to the synchronization addition circuit 7 and the matrix circuit 8, respectively. Note that the synchronization signal is generated by the synchronization generator 18, and each of the horizontal and vertical synchronization signals is supplied to the imaging section to drive the CCD 1.

The luminance signal Y is FM modulated in a high frequency range by an FM modulator 9, and then supplied to a magnetic head 13 via a bypass filter 10, a mixer 11, and a recording amplifier 12, and is recorded on a magnetic disk 14.

On the other hand, the color difference signals R-Y and B-Y of the matrix circuit 8
is converted into a line sequential signal by changeover switch 1-5, and Ii''
The signal is supplied to the M modulator 16. The F'M modulated line sequential signal is introduced into the mixer 11 through the low-pass filter 17, mixed with the FM luminance signal, and recorded on the disk 14.

The center frequency of the recorded FM color difference signal is 1.2 MHz for R-Y and 1.3 M(z) for B-Y due to the step difference.On the other hand, the luminance signal is FM modulated with a deviation of 6 to 7.5 MHz. , and the color difference signals are band-separated and recorded.

FIG. 3 is a circuit diagram of the main parts of the recording and reproducing system of the viewer 3 shown in FIG. 1, in which the reproduction special number is switch SW1. SW4゜sw6.
By switching sw7 (PB side), a signal path as shown by the thick line is formed. The reproduction output of the magnetic head 13 is introduced to a Y demodulator 21 and a C demodulator 22 via a reproduction amplifier 20, where it is FM-demodulated luminance signal Y and chroma signal C (
R-Y/B-Y line sequence) are respectively interlaced circuits 2
3 and to the synchronization circuit 24.

Interlace circuit 23 is 1/2H delay line 25
Interlaced odd and even field signals are formed by alternately selecting the output luminance signal delayed by 0.5H and the original luminance signal in the vertical period using the switch 8W2.

The output of the switch SW2 passes through a 1H delay line 26 for time alignment with the chroma system, passes through a switch SW3, and is derived as a luminance signal Y. Switch SW3 operates in synchronization with switch 8W2, and in odd field 0,
The output of the lH delay line 26 is selected. In the even field E, the 0.5H delay signal output from the 1/2H delay line 25 is selected by the switch SW2, and the 1/2H delay signal is selected by the switch SW2.
The input and output of the H delay line 26 are averaged by the adder 27 (
The arithmetic average) signal is selected by switch 8W3. This averaged signal is next to the odd field screen, while the color difference line sequential chroma signal C is first 1/1 for interlacing.
The signal passes through the 2H delay line 30 and a switch SW5 that alternately selects its input and output in vertical cycles, and is derived as the first chroma signal C1 from the midpoint of the series circuit of the 1H delay lines 31 and 32. This first chroma signal C1 is a color difference line sequential main line signal whose time axis matches the luminance signal. If you create a second chroma signal that is 1H behind or ahead of this main signal, these first chroma signals. A synchronized color difference signal is obtained from the second chroma signal.

In FIG. 3, an averaged signal of the input of the delay line 31 that is 1H ahead of the main signal and the output of the delay line 32 that is 1H behind the main signal is derived from the adder 33 as the second chroma signal C2.

The first and second chroma signals C1 and C2 are separated into synchronized R-Y and B-Y by a changeover switch not shown, and are further sent to a matrix decoder together with a luminance signal, R, G, It is converted into a B signal.

In addition, delay lines 25 and 26 t-30 to 32 are as follows:
A CCD, BBD, etc. can be used as the delay line, and if the video information is digitized, a RAM or a latch circuit can be used as the delay line. The luminance system delay lines 25 and 26 should be wideband delay elements that operate with a 4 fsc clock (fsc = 3.58 PJfH2), for example (the chroma system delay lines 30 to 32 operate with an fsc clock). A narrowband delay element may be used.

Next, when recording an external cobosite video signal such as an NT8C signal, switch sw1, sw4゜sw6
．． sw7 is switched to the REC side, a signal path as shown by the bold line in Fig. 4 is formed, and a 2H-type Y/C separation filter is configured.The switches sw2 and sw3
is fixed on the E side. At this time, the 1H delay lines 31 and 32 for synchronization of the chroma system are given a clock of 4 times the frequency, 4fsc, and thereby the delay time is converted, and the delay lines are used as wideband delay lines each having a delay time of 1/4H. used.

The input composite video signal is delayed by 1/2H from the BC side of the switch SW6 through the 1/4H delay lines 31 and 32, and further passes through the REC side of the switch sw1 to the 1/2H delay line 25#. The signal then passes through the 1H delay line 26 via the switch SW2.

This route delays the gate body by 2H. Here, the 1H delay signal, that is, the output of the 1/2 delay line 25 is assumed to be the main line signal.

The 2H delay signal output from the 1H delay line 26 is led to the adder 33 through the REC side of the switch 8W7.
Added to the non-delayed input signal.

This addition output is the average of the signals of the line before and after the main line, and is the interpolation corresponding to the main line signal.
The subcarrier i component is in reverse phase with the main signal. The output of the adder 33 is inverted by the inverter 34, passes through the REC side of the switch SW4, and is added to the main line signal in the adder 2T. As a result, the luminance component of the opposite phase is deleted, and the chroma component of the same phase is extracted. The output of the adder 27 is a bandpass filter 2 in the 3.58MHz band.
8 and is derived as a chroma signal C.

On the other hand, the main signal output from the 1/2H delay line 25 is led to the adder 29, where the bandpass filter 28
The output chroma signals C are added in opposite phases and are derived as a luminance signal Y.

In this way, the delay line of the playback system is 25.26°31.
32 and adders 27 and 33 are used to form the 2H comb filter of the recording system, even if the recording system is added, the number of circuit elements is not increased, and the cost can be lowered.

The 3.59 MHz chroma signal and luminance signal derived in FIG. 4 are then introduced into a decoder and converted into baseband RY and BY signals. This color difference signal is converted into a line sequential signal by a recording system similar to that shown in FIG. 2, further subjected to FM modulation, and then recorded on the magnetic disk cassette 2 together with the FM luminance signal.

In addition to the broadcast NT8C signal, the external video signal may be a PAL signal, an 8ECAN signal, or a video camera output.

Furthermore, in the above embodiment, the delay amount of the delay lines 31 and 32 of the playback system is changed and incorporated into the 2H comb filter of the recording system by changing the switch.
Delay line 31. ．． 32 to 1/4 and 3/4H respectively
2 delay elements using 1/4H output tap.
It may also be incorporated into an H-comb filter. In this case, a connection changeover switch is used, and there is no need to change the delay time.

Effects of the Invention According to the present invention, by adding some circuits to a magnetic disk sheet reproducing machine for electronic still cameras, broadcasting NT
Since it can also be used as a recorder for still recording 8C signals, etc., a device with high cost performance can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram schematically showing an electronic still camera system to which the still image recording and reproducing device of the present invention is applied;
The figure is a block diagram of the recording system of an electronic still camera, Figure 3 is a circuit diagram of the recording/playback system of Viewer 3 shown in Figure 1 in playback mode, and Figure 4 shows the circuit in Figure 3 switched to recording mode. It is a circuit diagram at the time. In addition, in the symbols used in the drawings, 3... Viewer-3a.
.........Magnetic disk sheet drive mechanism 3b......Reproduction circuit 3c... ...recording circuit 13...
......Magnetic head 14...
......Magnetic disk 23...
......Interlace circuit 24...
......Synchronization circuit 25...
...Delay line 26...
...Delay line 30.31.32...Delay line.

Claims (1)

[Claims] 1. A color video signal is divided into a luminance signal and a chroma signal using a comb filter, and the chroma signal is converted into a line-sequential color difference signal and recorded as still image information on a magnetic disk sheet together with the luminance signal. The system simultaneously converts the line-sequential color difference signal in the reproduced signal obtained from the recording circuit and the recorded magnetic disk sheet, converts the luminance signal from a field still signal to a frame still signal, and synthesizes these conversion outputs. A still image recording and reproducing device comprising: a reproducing circuit for obtaining a color still image video signal. 2. The reproduction circuit has a delay circuit for converting a line sequential color difference signal into a simultaneous signal and a delay circuit for converting a field still signal into a frame still signal, and the recording circuit has each of the delay circuits. 2. The still image recording and reproducing apparatus according to claim 1, further comprising a shared luminance/chroma separation comb filter.